216280263389 has 8 divisors (see below), whose sum is σ = 219158387448. Its totient is φ = 213415372800.

The previous prime is 216280263377. The next prime is 216280263401. The reversal of 216280263389 is 983362082612.

It is an interprime number because it is at equal distance from previous prime (216280263377) and next prime (216280263401).

It can be written as a sum of positive squares in 4 ways, for example, as 16880505625 + 199399757764 = 129925^2 + 446542^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216280263389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216280263349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3275462 + ... + 3340839.

It is an arithmetic number, because the mean of its divisors is an integer number (27394798431).

Almost surely, 2^216280263389 is an apocalyptic number.

It is an amenable number.

216280263389 is a deficient number, since it is larger than the sum of its proper divisors (2878124059).

216280263389 is an equidigital number, since it uses as much as digits as its factorization.

216280263389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6616735.

The product of its (nonzero) digits is 1492992, while the sum is 50.

The spelling of 216280263389 in words is "two hundred sixteen billion, two hundred eighty million, two hundred sixty-three thousand, three hundred eighty-nine".